forked from enlightenment/efl
eina_cxx: Add eina::string_view class (non owning reference to string)
Add an implementation of string_view to Eina C++. It is a non owning reference to a string that allows lightweight argument passing of both C++ std::string and C strings (const char*) on interfaces.
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9eb19f8852
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@ -27,6 +27,7 @@ bindings/eina_cxx/eina_ptrlist.hh \
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bindings/eina_cxx/eina_range_types.hh \
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bindings/eina_cxx/eina_ref.hh \
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bindings/eina_cxx/eina_stringshare.hh \
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bindings/eina_cxx/eina_string_view.hh \
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bindings/eina_cxx/eina_thread.hh \
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bindings/eina_cxx/eina_throw.hh \
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bindings/eina_cxx/eina_tuple.hh \
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@ -13,6 +13,7 @@
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#include <eina_array.hh>
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#include <eina_list.hh>
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#include <eina_stringshare.hh>
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#include <eina_string_view.hh>
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#include <eina_error.hh>
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#include <eina_accessor.hh>
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#include <eina_thread.hh>
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@ -0,0 +1,358 @@
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#ifndef EINA_STRING_VIEW_HH_
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#define EINA_STRING_VIEW_HH_
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#include <string>
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#include <iterator>
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#include <stdexcept>
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#include <algorithm>
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#include <eina_throw.hh>
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namespace efl { namespace eina {
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template <typename CharT, typename Traits = std::char_traits<CharT> >
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class basic_string_view
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{
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public:
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// Types:
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typedef Traits traits_type;
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typedef CharT value_type;
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typedef CharT& reference;
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typedef CharT const& const_reference;
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typedef CharT* pointer;
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typedef CharT const* const_pointer;
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typedef const_pointer const_iterator;
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typedef const_iterator iterator;
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typedef std::reverse_iterator<iterator> reverse_iterator;
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typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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typedef std::ptrdiff_t difference_type;
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typedef std::size_t size_type;
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// Constants:
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static constexpr size_type npos = size_type(-1);
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// Constructors:
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constexpr basic_string_view() noexcept
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: _str(nullptr), _len(0)
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{}
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basic_string_view(basic_string_view<CharT, Traits> const& other) noexcept = default;
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basic_string_view(basic_string_view<CharT, Traits>&& other) noexcept = default;
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template<typename Allocator>
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basic_string_view(std::basic_string<CharT, Traits, Allocator> const& str) noexcept
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: _str(str.data()), _len(str.length())
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{}
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basic_string_view(CharT const* c_str)
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: _str(c_str), _len(Traits::length(c_str))
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{}
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// basic_string_view(CharT const* c_str, size_type len) noexcept
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// : _str(c_str), _len(len)
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// {}
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// Assignment:
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basic_string_view<CharT, Traits>& operator=(basic_string_view<CharT, Traits> const& other) noexcept = default;
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basic_string_view<CharT, Traits>& operator=(basic_string_view<CharT, Traits>&& other) noexcept = default;
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// Iterators
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const_iterator begin() const noexcept { return _str; }
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const_iterator cbegin() const noexcept { return _str; }
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const_iterator end() const noexcept { return _str + _len; }
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const_iterator cend() const noexcept { return _str + _len; }
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const_reverse_iterator rbegin() const noexcept { return const_reverse_iterator(end()); }
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const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(end()); }
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const_reverse_iterator rend() const noexcept { return const_reverse_iterator(begin()); }
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const_reverse_iterator crend() const noexcept { return const_reverse_iterator(begin()); }
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// Capacity:
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size_type size() const noexcept { return _len; }
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size_type length() const noexcept { return _len; }
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bool empty() const noexcept { return _len == 0; }
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// Element access:
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const_reference operator[](size_type pos) const { return _str[pos]; }
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const_reference at(size_type pos) const
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{
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if (pos >= _len)
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EFL_CXX_THROW(std::out_of_range("efl::eina::basic_string_view::at"));
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return _str[pos];
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}
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const_reference front() const { return _str[0]; }
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const_reference back() const { return _str[_len-1]; }
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// Operations:
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CharT const* data() const noexcept { return _str; }
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size_type copy(CharT* s, size_type len, size_type pos = 0) const
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{
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Traits::copy(s, _str+pos, len);
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return len;
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}
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int compare(basic_string_view<CharT, Traits> const& s) const
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{
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const int cmp = Traits::compare(_str, s._str, (std::min)(_len, s._len));
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return cmp != 0 ? cmp : ( _len == s._len ? 0 : _len < s._len ? -1 : 1 );
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}
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int compare(size_type pos, size_type len, basic_string_view<CharT, Traits> const& s) const
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{
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const int cmp = Traits::compare(_str+pos, s._str, (std::min)(len, s._len));
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return cmp != 0 ? cmp : ( len == s._len ? 0 : len < s._len ? -1 : 1 );
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}
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int compare(size_type pos1, size_type len1, basic_string_view<CharT, Traits> const& s, size_type pos2, size_type len2) const
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{
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const int cmp = Traits::compare(_str+pos1, s._str+pos2, (std::min)(len1, len2));
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return cmp != 0 ? cmp : ( len1 == len2 ? 0 : len1 < len2 ? -1 : 1 );
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}
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bool starts_with(CharT c) const
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{
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return !empty() && Traits::eq(c, front());
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}
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bool starts_with(basic_string_view<CharT, Traits> const& s) const
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{
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return _len >= s._len && Traits::compare(_str, s._str, s._len) == 0;
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}
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bool ends_with(CharT c) const
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{
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return !empty() && Traits::eq(c, back());
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}
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bool ends_with(basic_string_view<CharT, Traits> const& s) const
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{
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return _len >= s._len && Traits::compare(_str + _len - s._len, s._str, s._len) == 0;
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}
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size_type find(basic_string_view<CharT, Traits> const& s) const
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{
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const_iterator iter = std::search(cbegin(), cend(), s.cbegin(), s.cend(), Traits::eq);
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return iter == cend () ? npos : std::distance(cbegin(), iter);
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}
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size_type find(basic_string_view<CharT, Traits> const& s, size_type pos) const
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{
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if (pos >= _len)
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return npos;
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const_iterator iter = std::search(cbegin()+pos, cend(), s.cbegin(), s.cend(), Traits::eq);
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return iter == cend () ? npos : std::distance(cbegin(), iter);
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}
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size_type find(CharT c) const
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{
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const_iterator iter = std::find_if(cbegin(), cend(), [=](CharT val) { return Traits::eq(c, val); });
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return iter == cend() ? npos : std::distance(cbegin(), iter);
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}
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size_type find(CharT c, size_type pos) const
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{
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if (pos >= _len)
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return npos;
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const_iterator iter = std::find_if(cbegin()+pos, cend(), [=](CharT val) { return Traits::eq(c, val); });
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return iter == cend() ? npos : std::distance(cbegin(), iter);
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}
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size_type rfind(basic_string_view<CharT, Traits> const& s) const
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{
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const_reverse_iterator iter = std::search(crbegin(), crend(), s.crbegin(), s.crend(), Traits::eq);
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return iter == crend() ? npos : reverse_distance(crbegin(), iter) - s.lenght();
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}
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size_type rfind(basic_string_view<CharT, Traits> const& s, size_type pos) const
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{
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if (pos >= _len)
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return npos;
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const_reverse_iterator iter = std::search(crbegin()+pos, crend(), s.crbegin(), s.crend(), Traits::eq);
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return iter == crend() ? npos : reverse_distance(crbegin(), iter) - s.lenght();
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}
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size_type rfind(CharT c) const
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{
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const_reverse_iterator iter = std::find_if(crbegin(), crend(), [&](CharT val) { return Traits::eq(c, val); });
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return iter == crend() ? npos : reverse_distance(crbegin(), iter);
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}
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size_type rfind(CharT c, size_type pos) const
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{
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pos = (pos >= _len) ? 0 : _len - pos - 1;
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const_reverse_iterator iter = std::find_if(crbegin()+pos, crend(), [&](CharT val) { return Traits::eq(c, val); });
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return iter == crend() ? npos : reverse_distance(crbegin(), iter);
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}
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size_type find_first_of(CharT c) const { return find(c); }
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size_type find_last_of (CharT c) const { return rfind(c); }
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size_type find_first_of(basic_string_view<CharT, Traits> const& s) const
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{
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const_iterator iter = std::find_first_of(cbegin(), cend(), s.cbegin(), s.cend(), Traits::eq);
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return iter == cend() ? npos : std::distance(cbegin(), iter);
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}
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size_type find_last_of(basic_string_view<CharT, Traits> const& s) const
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{
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const_reverse_iterator iter = std::find_first_of(crbegin(), crend(), s.cbegin(), s.cend(), Traits::eq);
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return iter == crend () ? npos : reverse_distance(crbegin(), iter);
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}
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size_type find_first_not_of(basic_string_view<CharT, Traits> const& s) const
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{
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const_iterator iter = find_not_of(cbegin(), cend(), s);
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return iter == cend() ? npos : std::distance(cbegin(), iter);
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}
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size_type find_first_not_of(CharT c) const
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{
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for (const_iterator iter = cbegin(); iter != cend(); ++iter)
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if (!Traits::eq(c, *iter))
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return std::distance(cbegin(), iter);
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return npos;
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}
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size_type find_last_not_of(basic_string_view<CharT, Traits> const& s) const
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{
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const_reverse_iterator iter = find_not_of(crbegin(), crend(), s);
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return iter == crend() ? npos : reverse_distance(crbegin(), iter);
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}
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size_type find_last_not_of(CharT c) const
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{
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for (const_reverse_iterator iter = crbegin(); iter != crend(); ++iter)
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if (!Traits::eq(c, *iter))
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return reverse_distance(crbegin(), iter);
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return npos;
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}
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// XXX: returning std::string instead of eina::string_view
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std::basic_string<CharT, Traits> substr(size_type pos, size_type len=npos) const
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{
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if (pos > size())
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EFL_CXX_THROW(std::out_of_range("efl::eina::string_view::substr"));
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if (len == npos || pos + len > size())
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len = size () - pos;
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return std::basic_string<CharT, Traits>(data() + pos, len);
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}
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// Conversions:
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std::basic_string<CharT, Traits> to_string() const
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{
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return std::basic_string<CharT, Traits>(_str, _len);
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}
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std::basic_string<CharT, Traits> str() const
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{
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return to_string();
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}
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template<typename Allocator>
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operator std::basic_string<CharT, Traits, Allocator>() const
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{
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return std::basic_string<CharT, Traits, Allocator>(_str, _len);
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}
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// Modifiers:
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// void clear() noexcept { _len = 0; }
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//
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// void remove_prefix(size_type n) noexcept
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// {
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// if (n > _len)
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// n = _len;
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// _str += n;
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// _len -= n;
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// }
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//
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// void remove_suffix(size_type n) noexcept
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// {
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// if (n > _len)
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// n = _len;
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// _len -= n;
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// }
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void swap(basic_string_view<CharT, Traits>& s)
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{
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std::swap(_str, s._str);
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std::swap(_len, s._len);
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}
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// Comparison operators:
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friend inline bool operator==(basic_string_view<CharT, Traits> const& s1, basic_string_view<CharT, Traits> const& s2)
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{
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if (s1.size() != s2.size())
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return false;
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return s1.compare(s2) == 0;
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}
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friend inline bool operator!=(basic_string_view<CharT, Traits> const& s1, basic_string_view<CharT, Traits> const& s2)
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{
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return !(s1 == s2);
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}
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friend inline bool operator<(basic_string_view<CharT, Traits> const& s1, basic_string_view<CharT, Traits> const& s2)
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{
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return s1.compare(s2) < 0;
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}
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friend inline bool operator>(basic_string_view<CharT, Traits> const& s1, basic_string_view<CharT, Traits> const& s2)
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{
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return s2 < s1;
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}
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friend inline bool operator<=(basic_string_view<CharT, Traits> const& s1, basic_string_view<CharT, Traits> const& s2)
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{
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return !(s2 < s1);
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}
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friend inline bool operator>=(basic_string_view<CharT, Traits> const& s1, basic_string_view<CharT, Traits> const& s2)
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{
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return !(s1 < s2);
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}
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private:
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template <typename Iterator>
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size_type reverse_distance(Iterator first, Iterator last) const
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{
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return _len - 1 - std::distance(first, last);
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}
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template <typename Iterator>
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Iterator find_not_of(Iterator first, Iterator last, basic_string_view<CharT, Traits>& s) const
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{
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for (; first != last; ++first)
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if (0 == Traits::find(s._str, s._len, *first))
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return first;
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return last;
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}
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const CharT* _str;
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size_type _len;
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};
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// Stream operation
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template<class CharT, class Traits>
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inline std::basic_ostream<CharT, Traits>&
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operator<<(std::basic_ostream<CharT, Traits>& os, basic_string_view<CharT,Traits> const& s)
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{
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return os << s.data();
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}
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template <typename CharT, typename Traits>
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void swap(basic_string_view<CharT, Traits>& s1, basic_string_view<CharT, Traits>& s2)
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{
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s1.swap(s2);
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}
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// Instantiations:
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typedef basic_string_view<char> string_view;
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typedef basic_string_view<wchar_t> wstring_view;
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typedef basic_string_view<char16_t> u16string_view;
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typedef basic_string_view<char32_t> u32string_view;
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} }
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#endif
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